Voice Recognition System PPT

VOICE RECOGNITION SYSTEM (VRS)

By:- Arun Sharma Sharma B.Tech, B.Tech, ECE 7th Sem

INTRODUCTION Voice Recognition Recogn ition System Systemss are those thos e systems which can recognize the voices of the individuals.

How Humans

do This????????

Articulation produces

sound waves which the ear conveys to the brain for processing. 3/34

How

might computers do this????

 Acoustic waveform

 Acoustic signal

 Digitization

analysis of the  Acoustic analysis speech signal

Speech recognition

 Linguistic interpretation 4/34

Isolated Systems requires a brief pause between the spoken words. While

Continuous Systems doesnt.

Speaker Dependent Systems recognize speech While Speaker S peaker--Independent

from only one speaker. speaker.

Systems can recognize anyones anyones speech.

How to

create a Voice Recognition System

 Speech Acquisition(Collection).  Speech Analysis.  User Interface Development.

Speech Acquisition  For training purpose the

speech is acquired using the microphone, for the analysis. 

The sound card of PC converts the Analog Speech input into digital format for further analysis.

Speech Analysis The First important step in Speech Analysis is to separate each word from the ambient noise.



 Further each spoken word is compared with the

inbuilt acoustic model or dictionary which is created during the training session. 

The above step is done with the help of an efficient speech detection algorithm.

User Interface Development  Final Step is to Develop a User Interface, so that all

users can use these system with ease. For Example: Speech Recognition System of Windows 7 looks so compact & is as shown below .

APPLICATIONS elephony and Other Domains.  Telephony  People with Disabilities.

ir-Traffic Controlle Controllerr.  Training Air-Traffic  High Performance Fighter Air-Craft.  Electronic Medical Records etc

People with Disability 

This picture shows how Voice Recognition System is helping a Disable man to complete his work.

Voice Recognition Gadgets 

Voice Recognition Recognitio n Systems can be embedded with modern gadgets. Example:-TV etc

Voice Recognition in HighPerf ormance Fighter Aircrafts

F-35 is

the first US Fighter Aircraft with Voice Recognition Recogniti on System able to hear the pilot spoken commands to manage various aircraft subsystems, subsystems, such as communications and navigation. navigation.



Voice Recognition System has substantially added in High-Performance Fighter Aircrafts.



This System helps the pilot to control the various subsystem in an effective manner manner..

Voice Recognition System: Flaws and Weakness  Low signal-t o-noise ratio.  Overlapping speech.  Differentiation b/w Homonyms.

er.  Intensive use of computer power.

HUMAN

PERFROMANCE

(According to a paper written by Lippmann in 1997)

Digits

Letters

0.8

7 6

0.6

5 4

0.4

3 Digits

0.2

Letters

2 1 0

0

Digits

Error Rate

Word Error Rate

How to

Remove Flaws and Weakness of VRS

 Using High Quality Microphone.  Use Good

Quality of Sound Cards.

System must be  System  If

trained properly.

possible work in quiet environment.

CONCLUSION 

Human performance figures suggests that we still have enormous room for improvement.

 At present several new

algorithms are developed to implement implement voice recognition system.

THANK YOU